Manhole closure



Patented Mar. 6, 1923;.

TnoMAsHujoNoHUE; or wnsnme'remvmsrnor or conclusie.

f v MANEOLE ctosUBn.'

f einem@ afee Nay 2.6

To all @hom it may. :concer/m;

over and upon the vtop of the lbase of the ring. When it is foundnecessary to' remove the ring, for example in replacing the transformerin electric .conduit work, the asphalt or concrete must be laboriouslydug up and from about the ring. This leaves a large hole or broken-uparea in the street', which after the ring has been again replaced, mustbe repaired by filling in withasphalt or concrete in order to restorethe street surface to its former condition. The street repair work can,incertain municipalities, be done only by the municipal authorities, and:consequently it not infrequently occurs that a considerable periodelapses before the street can be repaired by such authorities. In themeantime, the electric light or telephone company operating the manholeis responsible or liable for any damages resultant from the condition ofthe street pending repair of the latter. Usually temporary fillingmatter is used by the company in the aforementioned instances until theproper authorities can effect permanent repairs to the street. n

The present invention therefore aims to provide a closure whicheliminates all of the foregoing objections and brieiy resides in aunitary structure composed of .a concrete base the top surface of whichis finished to form a part of the street or pavement surface and amanhole cover frame about which the base is molded, sov that the base`and therewith the frame can be bodily dislodged orremoved `from thekstreet and then 'replaced without the necessity of cutting up.

the street except as concerns a slight cut of about one-half an inchmarginally of the base so -as to allow the latter tobe lifted outof-pla'ce.' Upon replacement, grout, or other suitable semi-liquidfiller may be pouredin the out and the joint will then ybe ccmpleteflet?, seriem- SSW! and` rendered fit for service upon merefharol-A i. 7.U 3 v er-iing,thus eliminating the useof atemporary filling and `alsoysaving the'expensefofresurf fafciiigthe'streetcontiguous totheman-hole,rv 60 ii@ Yi'.livelliiwi@ 'further eine 't0n rfQ'Vd aclosurey'l whichfwill support' the cast-iron V- veh'icular trafficimposing static pressure and'stralns or stresses thereon.

Further and other ob'e'ts be laterfset erth ,and manifestedifnitheaeirse fith@ 'flnthe drenDgS i g Figure 1","is" 'ai top plan viewofthe `rinven-` tion: Figure 2, is asection on line l2 2 of Figure 1,and y f Figure 3, is a .fragmentary sectional view of a modified vformof the invention.

In proceeding in accordance with the present invention, a-concrete basev1, is employed which as depicted in Figure'1,has a preferably squareformation and is equipped with reinforcing rods 2, which aresuperimposedSO upon each other in hollow 'square formation and uponwhich in turn is superimposed the cast-iron ring or frame 3, the latterreceiving the cover, not shown. Wings, anges, fins or webs 4, extendradially of the ring vand are preferably of less height than that ofthe'ring,the lower faces ofthe webs also seating on `the reinforcingrods as depicted in Figure 2, of the drawings. The lower or bottom edgeof the ring, at-points between the webs 4, is cut-away in curvedformation as depicted in Figure 2, sothat a part of the f concrete basewill project up into the ring to thereby provide a thickened part of thebase for 4supporting the ring so as vto prevent breakage due tovehicular ,or other traic occurring over the base and ring. l

As shown in Figure 3, of the drawings the concerete may terminate belowthe topv of the metal so that an asphalt top covering 5 may be appliedto correspond to streets or j n y the drive and the base is filled withliquid 105 y grout, so that in removing the base in cases Vwhere thetransformer is to be removed andl va newA one or'another installed, itis merely necessaryto remove the seam and then the base, `which may bedone by force exerted 110 `from both above'and below the base.Contrainent'iys when the base'is replaced or frames-e as? to 'preventbieakagethefeof 'afee placed back into position7 it is Inereljy7necessary to pour grout into the seam, which upon hardening completesthe Work and entirely eliminates all of the foregoing objectionsheretofore presented. A

Further1 the invention may be used With rectangular manholes and inthisuse the customary I`bea1ns vfor supporting the iron ring heretoforeused, are dispensed with, the base spanning the Width of the manhole anditseli:1 taking` the place of the T-beams for supporting theiron-ringheretofore used, the base spanning the Width of the manhole.The spaces at the ends of the base are easily filled with 'concretel byuse of 'forms,for sin- .Qle boards, since such spaces do not exceed afewinehes in Width.

AVhat is claimed is:

In a manhole closure for velectric conduits and the like.I a concretebase having a central opening and a metal cover-receiving Jframeembedded in the base and forming a'lining for the central opening, saidlfra-ine having a `cover-seat disposed below` the upper face of theconcrete base, Webs extending outwardly from the :traine and into thebase, said vbase being' formed so as to provide a covering fortheinanholeandto leave a seam-forming space between the marginal edges vofthe base and the street surface contiguous thereto whereby `the base yisbodily removable from over the manhole Without breaking up of the streetsurface. thebase having its top surfaee'finished to lie flush with thestreet surf-ace and to provide a; continuation there` of, and aremovable filler for said seam- 'forming space, said seam-forming spacebeing of substantial width, so as toy allow the illerto be rernovedWithout disturbing the base or the street surface contiguous thereto.

In testimony whereof I affix` my signature.

THOMAS DGNCHUE.

